Evo13 wroteAs a general rule of thumb, you'd require 75mm stud length to accommodate a 12mm spacer and 90mm to fit up to 18mm—this is all depending on the available thread area on a specific stud (FC actually makes an M14 stud kit that will accept a 15mm spacer on a compact 80mm thread body), but other companies rarely deviate from this.Thinking about ordering 15/12. But, I could use some clarification wheel stud conversion kit if anyone would like to chime in.
What size stud length should I opt for with consideration for the spacers?
Do I go with 45mm or 75mm? I have 245s in the front and 265s in the rear on style 359M wheels (I dont know if that matters).
We dialed in an E92 M3 running 19" CI-R with some Future Classic spacers and it turned out perfect




Front: 19x9.5+25 (+20 with 5mm FC Spacer)
Rear: 19x10.5+35 (+25 with 10mm FC Spacer)
